2728194821121 has 48 divisors (see below), whose sum is σ = 4625569283328. Its totient is φ = 1414357207200.

The previous prime is 2728194821063. The next prime is 2728194821137. The reversal of 2728194821121 is 1211284918272.

It is not a de Polignac number, because 2728194821121 - 2⁶ = 2728194821057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2728194821921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 924175 + ... + 2512068.

It is an arithmetic number, because the mean of its divisors is an integer number (96366026736).

Almost surely, 2^{2728194821121} is an apocalyptic number.

2728194821121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2728194821121 is a deficient number, since it is larger than the sum of its proper divisors (1897374462207).

2728194821121 is a wasteful number, since it uses less digits than its factorization.

2728194821121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436762 (or 3436755 counting only the distinct ones).

The product of its digits is 258048, while the sum is 48.

The spelling of 2728194821121 in words is "two trillion, seven hundred twenty-eight billion, one hundred ninety-four million, eight hundred twenty-one thousand, one hundred twenty-one".